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Dissolution Capsule Sinkers


Floating dosage forms rarely dissolve at a reproducible rate. Using a sinker in Apparatus 2 fixes the dosage form to a certain point and aids reproducibility. Sinkers can also be useful where dosage forms may stick to the sides of the vessel.

General guidelines to consider when choosing a sinker for your application include: 

  • Sinker Size - the sinker should have minimal surface contact with the tablet as this can affect the dissolution rate.
  • Sinker Weight - should be kept to a minimum - just enough to have a desired effect.
  • PTFE Coated Sinkers Magnetic - used with magnetic retrieval systems,  or where there may be a reaction between steel and the tablet.
  • Uncoated - type 316 stainless steel sinkers are more durable than coated sinkers.
  • Basket Sinkers - can be used but care should be taken that the outer coating of the tablet does not clog the mesh
  • Wire Spirals - should be as wide as practically possible to avoid clogging.


Item Name Product Image Price

QLA 100 Mesh Screen Insert for Sotax In Shaft Sampling, 316 SS - SHFTSCR-ST

100 Mesh Screen Insert for Sotax In Shaft Sampling, 316 SS
QLA 100 Mesh Screen Insert for Sotax In Shaft Sampling, 316 SS - SHFTSCR-ST £15.34Buy Now

QLA 100 Mesh Sinker Basket with Lid, 316 SS - SNK100-VK

100 Mesh Sinker Basket with Lid, 316 SS
QLA 100 Mesh Sinker Basket with Lid, 316 SS - SNK100-VK £225.97Buy Now

QLA O-Ring Sinker, Stainless Steel, 11.8 x 25.8 mm Capacity - CAPWHT-S99 (8399)

O-Ring Sinker, 316 Stainless Steel, 11.8 x 25.8 mm Sotax OEM No: 8399 O-Ring sinkers are useful where a capsule expands or swells during the dissolution process. An expandable rubber ring allows size changes while the stainless steel inside...
QLA O-Ring Sinker, Stainless Steel, 11.8 x 25.8 mm Capacity - CAPWHT-S99 (8399) £18.57Buy Now

QLA Ropinirole Cylinder Sinker, 37mm L x 19mm D, 316 SS - CUSBSK-ROP

Ropinirole Cylinder Sinker, 37mm L x 19mm D, 316 SS
QLA Ropinirole Cylinder Sinker, 37mm L x 19mm D, 316 SS - CUSBSK-ROP £302.64Buy Now

QLA Screw on Cap for part# CAPWSC-01S, 316 SS - CAPWSC-CAP01S

Screw on Cap for part# CAPWSC-01S, 316 SS
QLA Screw on Cap for part# CAPWSC-01S, 316 SS - CAPWSC-CAP01S £28.24Buy Now

QLA Spiral Capsule Sinker with Screw on Cap, 316 SS, .9” (22.9mm) L x .281” (7.1mm) Total capacity /Actual ID capacity .765” (19.4mm) x .275”(7mm), 6 coils - CAPWSC-01S

Spiral Capsule Sinker with Screw on Cap, 316 SS, .9” (22.9mm) L x .281” (7.1mm) Total capacity /Actual ID capacity .765” (19.4mm) x .275”(7mm), 6 coils
QLA Spiral Capsule Sinker with Screw on Cap, 316 SS, .9” (22.9mm) L x .281” (7.1mm) Total capacity /Actual ID capacity .765” (19.4mm) x .275”(7mm), 6 coils - CAPWSC-01S £63.75Buy Now

QLA Spiral Capsule Sinker, PTFE coated 316 SS, .885" (22.5mm) L x .575" (14.6mm) W capacity, 8.5 coils - CAPWHT-XSTEF

Spiral Capsule Sinker, PTFE coated 316 SS, .885" (22.5mm) L x .575" (14.6mm) W capacity, 8.5 coils
QLA Spiral Capsule Sinker, PTFE coated 316 SS, .885" (22.5mm) L x .575" (14.6mm) W capacity, 8.5 coils - CAPWHT-XSTEF £39.55Buy Now

QLA U Shaped Sinker, 1.024” (26mm) length (fits Capsule Sizes 0 and 1), 316 SS - CAPWHT-U01

U Shaped Sinker, 1.024” (26mm) length (fits Capsule Sizes 0 and 1), 316 SS
QLA U Shaped Sinker, 1.024” (26mm) length (fits Capsule Sizes 0 and 1), 316 SS - CAPWHT-U01 £60.52Buy Now

QLA Universal 8 Mesh Basket Sinker - BSK008-01

Universal 8 Mesh Basket Sinker Hand Fabricated Style - Can be used in all dissolution applications QLA innovated basket manufactured from woven stainless steel wire. Designed for larger capsules that float very easily and where a traditional...
QLA Universal 8 Mesh Basket Sinker - BSK008-01 £98.45Buy Now

QLA 8 Mesh Stainless Steel Sinker Basket, Flip Lid, 4cm x 1.5cm I.D. - BSK008-4x1.5cm

8 Mesh Stainless Steel Sinker Basket 8 mesh sinker basket, 316 Stainless Steel with flip lid, 4cm x 1.5cm I.D. Can be used in all dissolution applications The Sinker Floating tablets rarely dissolve at a reproducible rate. Using  a sinker...
QLA 8 Mesh Stainless Steel Sinker Basket, Flip Lid, 4cm x 1.5cm I.D. - BSK008-4x1.5cm
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QLA 8 Mesh Basket Sinker Japanese Pharmacopeia Size - BSK008-JP

8 Mesh Basket Sinker Japanese Pharmacopeia Size Hand Fabricated Style - Can be used in all dissolution applications QLA innovated basket manufactured from woven stainless steel wire Same dimensional size as the Japanese Sinker Designed for...
QLA 8 Mesh Basket Sinker Japanese Pharmacopeia Size - BSK008-JP £98.45Buy Now

QLA PTFE Capsule Sinker, 6 Spiral, 22.9 x 9.4 mm Capacity - CAPWHT-02

PTFE Capsule Sinker, 6 Spiral, 22.9 x 9.4 mm Helix Coil Type - Can be used in all dissolution applications Magnetic sinkers are designed to work with robotic dissolution equipment ensuring the easy removal and change of sinkers. PTFE coating...
QLA PTFE Capsule Sinker, 6 Spiral, 22.9 x 9.4 mm Capacity - CAPWHT-02 £31.07Buy Now

QLA PTFE Coated Capsule Sinker, 4 Spiral, 26.0 x 9.7 mm Capacity - CAPWHT-04

PTFE Coated Capsule Sinker, 4 Spiral, 26.0 x 9.7 mm Helix Coil Type - Can be used in all dissolution applications Magnetic sinkers are designed to work with robotic dissolution equipment ensuring the easy removal and change of sinkers. PTFE...
QLA PTFE Coated Capsule Sinker, 4 Spiral, 26.0 x 9.7 mm Capacity - CAPWHT-04 £31.07Buy Now

QLA Stainless Steel Capsule Sinker, 6 Spiral, 22.9 x 9.4 mm Capacity - CAPWHT-2S

Stainless Steel Capsule Sinker, 6 Spiral, 22.9 x 9.4 mm Helix Coil Type - Can be used in all dissolution applications Manufactured from media resistant stainless steel. 6 spiral sinkers are completely reproducible from sinker to sinker thus...
QLA Stainless Steel Capsule Sinker, 6 Spiral, 22.9 x 9.4 mm Capacity - CAPWHT-2S £20.98Buy Now

QLA Stainless Steel Capsule Sinker, 4 Spiral, 26.0 x 9.7 mm Capacity - CAPWHT-4S

Stainless Steel Capsule Sinker, 4 Spiral, 26.0 x 9.7 mm Helix Coil Type - Can be used in all dissolution applications Manufactured from media resistant stainless steel. 4 spiral sinkers are completely reproducible from sinker to sinker thus...
QLA Stainless Steel Capsule Sinker, 4 Spiral, 26.0 x 9.7 mm Capacity - CAPWHT-4S £20.98Buy Now

QLA PTFE Coated Capsule Sinker, 4 Spiral, 33.5 x 10.4 mm Capacity - CAPWHT-LG

PTFE Coated Capsule Sinker, 4 Spiral, 33.5 x 10.4 mm Helix Coil Type - Can be used in all dissolution applications Magnetic sinkers are designed to work with robotic dissolution equipment ensuring the easy removal and change of sinkers. PTFE...
QLA PTFE Coated Capsule Sinker, 4 Spiral, 33.5 x 10.4 mm Capacity - CAPWHT-LG £33.89Buy Now

QLA Spiral Capsule Sinker, Orange Coated Music Wire, 1.10" L x .41" W - CAPWHT-LGMT

Spiral Capsule Sinker, Orange Coated Music Wire Helix Coil Type -  1.10" L x .41" W capacity, 6.5 coils The Sinker Floating tablets rarely dissolve at a reproducible rate. Using  a sinker in Apparatus 2 fixes the tablet...
QLA Spiral Capsule Sinker, Orange Coated Music Wire, 1.10" L x .41" W - CAPWHT-LGMT £44.79Buy Now

QLA Breath Film Stainless Steel Sinker - CAPWHT-PC

Breath Film Sinker Can be used in all dissolution applications Specially designed to sink thin film but marinating minimal contact with the surface area. The Sinker Floating tablets rarely dissolve at a reproducible rate. Using  a...
QLA Breath Film Stainless Steel Sinker - CAPWHT-PC £45.60Buy Now

QLA 3 Pronged Capsule Sinker, Uncoated Stainless Steel, VanKel (Varian) Style - CAPWHT-SV

3 Pronged Capsule Sinker, Uncoated Stainless Steel, VanKel (Varian) Style Can be used in all dissolution applications Thinner design than traditional 3-prong sinker and uncoated. This design of sinker grips the capsule until the capsule casing...
QLA 3 Pronged Capsule Sinker, Uncoated Stainless Steel, VanKel (Varian) Style - CAPWHT-SV £16.95Buy Now

QLA Time Release Capsule Sinker - CAPWHT-TR

Time Release Capsule Sinker   Can be used in all dissolution applications   Specially designed for long release tablets or capsules, the time release capsule sinker uses the minimum amount of wire to hold tablet stationary during...
QLA Time Release Capsule Sinker - CAPWHT-TR £23.00Buy Now